The crew of the Queen Tara ship were super friendly and lunch was delicious but this was an overall disappointing experience. For a river experience, instead book a sunset cruise in Phnom Penh on the same ship the river views quickly become non-inspiring once you leave town. As a means of getting from PP to Siem Reap, it's just slow and very expensive. Go by bus or van both faster and much cheaper or fly similar cost or cheaper.